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KMID : 0362220100370040281
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Journal of The Korean Research Society for Dental Materials
2010 Volume.37 No. 4 p.281 ~ p.288
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Effect of MgO Fraction on the Properties of Infiltrated Glass
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Choi Yu-Ri
Kim Yong-Mo
Kim Kyoung-Nam
Kim Kwang-Mahn
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Abstract
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This study was to investigate the effect of MgO addition to La2O3-Al2O3-SiO2 based glass on the properties of the infiltrated glass. Several fractions of MgO (0, 0.5, 1.0, 1.5, and 2.0 wt%) were added to the La2O3(38-40 wt%)-Al2O3(19 wt%)-SiO2(19 wt%)-B2O3(16 wt%)-Na2O(4 wt%)-CaO(2 wt%) glass. Glasses were prepared by melting the appropriate mixtures of oxide powders followed by quenching in a water bath after holding at 1400℃, and then grinding into a powder using a planetary mill. The high temperature viscosity of the molten glasses was measured using high temperature viscometer according to the ASTM C-965. The glass powder-water slurry was placed on the partially sintered alumina (Accumt Mat Co., USA) preforms and infiltration was done at 1,150℃ for 20 min and then air cooled. The depth of glass infiltration in glass-alumina composites was measured using a stereomicroscope (SMZ- U, Nikon, Japan). Measurements were performed 10 times per experimental groups and averaged. The data were analyzed with one-way ANOVA. The high temperature viscosity of glass was decreased with increasing of MgO fraction. The infiltration depth in glass-alumina composite was increased with increasing of the MgO f raction (1,090±63 μm f or 0% MgO, 1 ,101±24 μm f or 0.5% MgO, 1 ,128±21 μm f or 1 .0% MgO, 1,168±18 μm for 1.5% MgO, and 1,214±22 μm for 2% MgO). The addition of MgO to lantanium alumino-silicate glass may improve the infiltration behavior in the preformed alumina.
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KEYWORD
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Infiltration, Lantanium aluminosilicate glass, MgO, High temperature viscosity, Infiltration depth
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